Multi-Zone Passageway Monitoring System and Method
a monitoring system and multi-zone technology, applied in the field of machine vision systems, can solve problems such as problems such as problems such as the inability to directly determine the direction and/or velocity of objects, and the inability of sensors to be well suited to certain security systems, and achieve the effect of maintaining uniform sensitivity and reducing the number of false positives
Inactive Publication Date: 2008-05-01
COGNEX CORP
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Benefits of technology
[0023]The details of one or more implementations are set forth in the accompanying drawings and the descriptio
Problems solved by technology
Such sensors may not be well suited for certain security systems because they are easily circumvented; they only detect a certain class of objects moving through a narrowly constrained space; and they cannot directly determine the direction and / or velocity of an object.
These sensors may have problems maintaining uniform sensitivity throughout a monitored space and / or over time and may be prohibitively expensive.
Such monocular systems may have difficulty distinguishing e.g., shadows and lighting effects from actual 3-dimensional (i.e., 3d) objects.
This problem may be exacerbated in certain security systems wherein e.g., a pre-alarm condition triggers a warning strobe light that affects detected images of the monitored space.
Such training may involve tedious and expensive procedures.
Method used
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[0032]Referring to FIG. 1, there is shown a machine vision system 10 mounted above an actuatable passageway 12, wherein a pair of cameras are positioned so that they look downward and outward towards an incoming area 14 (e.g., the area directly in front of passageway 12). Optionally, another pair of cameras may be mounted on the other side of passageway 12 looking at an outgoing area (i.e., in the direction of arrow 16). Machine vision system 10 may include a plurality of discrete cameras (e.g., cameras 18, 20). While machine vision system 10 is shown to include two cameras (namely cameras 18, 20), this is for illustrative purposes only and is not intended to be a limitation of this disclosure, as the number of cameras may be increased / decreased pursuant to various design requirements.
[0033]Machine vision system 10 may be calibrated to adjust for the height of machine vision system 10 with respect to the ground plane. Therefore, when an object enters the field of view of machine vis...
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A method, computer program product, and machine vision system for monitoring an activity area proximate an actuated passageway for the occurrence of an object-related event. The activity area includes a first activity zone and at least a second activity zone. The first and the at least a second activity zones are essentially parallel to the activity area. The actuated passageway is actuatable with a control signal. The occurrence of an object-related event is detected within the activity area. If the object-related event occurs within the first activity zone, a first algorithm is executed to generate the control signal. If the object-related event occurs within the at least a second activity zone, a second algorithm is executed to generate the control signal.
Description
RELATED APPLICATION(S) [0001]This disclosure is a continuation-in-part of U.S. patent application Ser. No. 10 / 749,335, filed 31 Dec. 2003; which claims the priority of and is a continuation-in-part of U.S. patent application Ser. No. 10 / 388,925, filed 14 Mar. 2003; which claims the priority of U.S. Provisional Patent Application No. 60 / 408,266, filed 05 Sep. 2002. Each of the above-listed applications is herein explicitly incorporated by reference.TECHNICAL FIELD [0002]The present disclosure relates to machine vision systems and, more particularly, to multi-zone machine vision systems for monitoring passageways.BACKGROUND [0003]The movement of people and / or objects through various spaces and passageways may be monitored and / or controlled for any number of purposes including safety and security. Such monitoring and / or control may be performed most efficiently when it is done automatically by machine with little or no human interventions.[0004]Various sensors are known for use in auto...
Claims
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Login to View More IPC IPC(8): G08B13/18
CPCG06K9/00771G06T7/204H04N7/181G06T2207/30232G06T2207/30241G06T2207/10016G06T7/248G06V20/52
InventorMARRION, CYRIL C.FIX, RAYMOND A.NICHANI, SANJAY
OwnerCOGNEX CORP